Smoother, stronger and more reliable lever and carrier springs for your Uberti lever action rifleFits the following Uberti Rifles and Carbines Models1860, 1866, 1873.Will NOT fit the original Winchester or Miroku style riflesMade from .076" 100% music wire alloyTested to significantly reduce wear on cam surfacesMore tolerant of wear variation from manufacturing tolerancesLarger radius at the "Tab"Smoother and more durable operation3.5 times less likely to fatigue over timeTested to over 900,000 equivalent lever cycles without any loss of tensionKit comes with both lever and carrier springs along with 2 new hardened screws